William Donn de Burgh, 3rd Earl of Ulster

William Donn de Burgh, 3rd Earl of Ulster (17 September 1312-6 June 1333) was Earl of Ulster from 1326 to 1333, succeeding Richard Og de Burgh, 2nd Earl of Ulster and preceding Elizabeth de Burgh, 4th Countess of Ulster.

Biography
William Donn de Burgh was born in 1312, the grandson of Richard Og de Burgh, 2nd Earl of Ulster. William became Lord of Connacht and Earl of Ulster on his grandfather's death in 1326, and he served in Parliament from 1327 to 1328 before briefly serving as Lord Lieutenant of Ireland in 1331. In 1332, he had his cousin Walter Liath de Burgh starved to death after Walter attempted to seize Connacht, so Walter's sister Gylle de Burgh plotted William's assassination. In June 1333, Richard de Mandeville, Sir John de Logan, and a few other English nobles killed William; they would be put to death in revenge.